to win justice department approval, the new mega airline agreed to give uptake-off and landing slots in gates at marriage airports. that concession will give competing low-cost airlines more access to major cities like network, boston, chicago, miami, los angeles, and washington, d.c. probably the best thing for consumers is competition. some of those smaller airlines, which aren't so small, airlines like jet blue and southwest, have figured out on way to make a profit and to serve routes that are being skipped by the big airlines. so, if this merger drops routes, it could be an opportunity for those smaller communicateties to move in. >> details are expected to be finalized by monday morning. employees of the new american airlines group are scheduled to be on hand at the new york stock exchange to ring the opening bell. juan carlos molina, al jazeera, new york. it's not a video game but it sure looks like one. still ahead on al jazeera america, how 3d imagery is saving lives and helping to learn about new ones.